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. 2013 Jul 23;5(7):1314–1331. doi: 10.3390/toxins5071314

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© 2013 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

PMC Copyright notice

Structural view on toxin-fold (SCOP g.7.1). SCOP classification is based on SCOP 1.75B. There are three families that compose the superfamily g.7.1 including: (i) g.7.1.1, snake venom toxins (28 protein domains) (ii) g.7.1.2, dendroaspin (one protein) and (iii) g.7.1.3, Extracellular domain of cell surface receptors (five protein domains). Representative examples are shown with their Protein Data Bank (PDB) identifier and the organism. The overall representatives share less than 40% sequence identity. Note that the structural similarity is high, with three loops and nearly all structure dominated by the β-strands. The length of most of these structural domains ranges from 65–85 amino acids.